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Finding the Fourth Proportional to 907.15, 1,361.56 and 859.08

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Solution

The fourth proportional to 907.15, 1,361.56 and 859.08 is: 1,289.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.15 : 1,361.56 = 859.08 : x
  2. Step 2: Convert to fraction form
    907.15/1,361.56 = 859.08/x
  3. Step 3: Cross multiply
    907.15x = 1,361.56 × 859.08
  4. Step 4: Simplify right side
    907.15x = 1,169,689.70
  5. Step 5: Solve for x
    x = 1,169,689.70/907.15
  6. Step 6: Final answer
    x = 1,289.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.